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UTV's Off Road ( RZR, YXZ, Mini Buggy, Carts,etc.) => UTV Chassis and Suspension => Topic started by: Stomper on January 03, 2010, 09:49:32 PM

Title: a arm mounting points
Post by: Stomper on January 03, 2010, 09:49:32 PM
I have type 4 cv's. When I mount the tabs for the a arms to the frame should I make the pivot point (attachment point) of the a arms line up with the pivot point of the cv. And the same for the upright (Wheel)side also.
And where exactly is the pivot point of a cv. In the center of the outer race, if thats what it is called?
I hope this makes sence
Title: Re: a arm mounting points
Post by: Stomper on January 03, 2010, 09:51:54 PM
How come every time I submit a post the sceen goes blank and I have to go back into catagory that I posted in to see it. ???
Title: Re: a arm mounting points
Post by: SPEC on January 04, 2010, 05:19:44 AM
Check your settings on the CP...I get that when I post and get a PM at the same time
Title: Re: a arm mounting points
Post by: fabr on January 04, 2010, 07:02:25 AM
I have type 4 cv's. When I mount the tabs for the a arms to the frame should I make the pivot point (attachment point) of the a arms line up with the pivot point of the cv. And the same for the upright (Wheel)side also.
And where exactly is the pivot point of a cv. In the center of the outer race, if thats what it is called?
I hope this makes sence
yes
Maybe but not likely
yes
Title: Re: a arm mounting points
Post by: Stomper on January 04, 2010, 10:43:30 AM
yes
Maybe but not likely
yes

Could you please explain more on the "Maybe but not likely"
Does it matter if the axle is not centered between the two a arms, like on the barricuda, it is closer to the bottom a arm but parralel to both, or as long as the distance on the frame mounts is the same distance as the upright mounts.
Title: Re: a arm mounting points
Post by: fabr on January 04, 2010, 11:17:15 AM
If the same length arms are used top and bottom you would have no camber gain on suspension droop. You generally want camber gain. Problem is that the droop is reduced by the amount of degrees of camber gain. Usually approx 2-5 degrees. To accomplish that you need a shorter top arm. Arm mount points also influence suspension geometry changed. Many of us before we had CAD abilities just drew it out full size on the shop floor andphysically saw what happens.
Title: Re: a arm mounting points
Post by: Stomper on January 04, 2010, 03:57:10 PM
So, camber gain is accomplished when the top of the tire leans in towards the buggy. Right :-[
Title: Re: a arm mounting points
Post by: Boostinjdm on January 04, 2010, 03:59:12 PM
No, that's just camber.  Camber gain is when the tire leans in more at full bump than it did at full droop.
Title: Re: a arm mounting points
Post by: BDKW1 on January 04, 2010, 04:25:26 PM
No, that's just camber.  Camber gain is when the tire leans in more at full bump than it did at full droop.

Camber gain is the amount it changes from ride height to full bump.
 
Getting this set-up correctly with A-arms can be kind of a pain. If the lower arm is below the centerline of the axle it needs to get longer. Sometimes this is hard to do with brake rotors and stuff getting in the way. Your best bet is to have to lower arm pivot at the same plane as your axle. Then you can dick around with the upper arm length to get the desired camber gain without getting to much in the way of plunge.......
Title: Re: a arm mounting points
Post by: fabr on January 04, 2010, 05:01:46 PM
yup
Title: Re: a arm mounting points
Post by: Boostinjdm on January 04, 2010, 11:50:25 PM
Yeah, I was in a hurry.  Point was that the word "gain" tells ya there's some change going on.
Title: Re: a arm mounting points
Post by: mvash on January 05, 2010, 05:57:43 PM
Title: Re: a arm mounting points
Post by: mvash on January 05, 2010, 05:59:12 PM
Title: Re: a arm mounting points
Post by: fabr on January 05, 2010, 06:49:35 PM
I think it should have said the lower arm should be parallel to the axle,not in the same plane.. Thanks for pointing that out.
Title: Re: a arm mounting points
Post by: BDKW1 on January 05, 2010, 11:34:48 PM
With the lower mounted up parallel with the axle the load on the upper arm will actually be less. It also gets your lower more ground clearance while still providing protection for the axle.
Title: Re: a arm mounting points
Post by: Stomper on January 07, 2010, 08:53:41 PM
Title: Re: a arm mounting points
Post by: Stomper on January 07, 2010, 09:00:04 PM

Camber gain is the amount it changes from ride height to full bump.
 
Getting this set-up correctly with A-arms can be kind of a pain. If the lower arm is below the centerline of the axle it needs to get longer.  Sometimes this is hard to do with brake rotors and stuff getting in the way. Your best bet is to have to lower arm pivot at the same plane as your axle. Then you can dick around with the upper arm length to get the desired camber gain without getting to much in the way of plunge.......

I hope this does't sound too stupid, but does'nt the lower a arm have to be below the centerline of the axle?  ???
Title: Re: a arm mounting points
Post by: fabr on January 07, 2010, 09:04:20 PM
 ;D ;D ;D ;D ;D
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